TS EN 62381

TS EN 62381. OFFICIAL SCOPE IS UNAVAILABLE. This standard is centered on the terminology and conceptual separation of acceptance and integration tests used for automation systems in the process industry. From its title, the technical focus is on three related stages: factory acceptance test (FAT), site acceptance test (SAT), and site integration test (SIT). Together, these terms describe how an automation system is checked before shipment, after installation, and when it is connected to the wider plant environment.

How FAT, SAT and SIT differ in practice

In general engineering usage, FAT usually takes place at the supplier’s premises and is intended to confirm that the delivered system performs the expected functions in a controlled setting. SAT is carried out at the actual site, where installation details, local conditions, and user operating scenarios become relevant. SIT goes a step further by focusing on interoperability: it checks whether the automation system works correctly with adjacent subsystems, plant networks, instrumentation, and higher-level software. These distinctions matter in process projects because commissioning is usually staged, responsibilities are split between vendor and owner, and integration issues often appear only when systems are combined.

Because the official scope is not available here, it is safest to treat TS EN 62381 as a terminology- and concept-oriented reference for test phases rather than as a source for specific mandatory procedures or numerical acceptance limits.